Usually between 7 am and 9.30 am, and 6,30 pm to 8.30 pm. During the day, the metro generally runs well with intervals between trains of 3–7 minutes. I know in London for example you would expect a greater frequency, and in Madrid this gap can be inconvenient if you have to change lines. It could mean that a journey that takes you 30 minutes today could take 45 tomorrow, depending on connections.